package cn.edu.abtu.controller;

import cn.edu.abtu.dao.UcenterMemberDao;
import cn.edu.abtu.entity.UcenterMember;
import cn.edu.abtu.exceptionhandler.GuliException;
import cn.edu.abtu.utils.ConstantWxUtils;
import cn.edu.abtu.utils.HttpClientUtils;
import cn.edu.abtu.utils.JwtUtils;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.net.URLEncoder;
import java.util.Date;
import java.util.HashMap;

@CrossOrigin
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberDao ucenterMemberDao;

    //1.生成微信扫描二维码
    @GetMapping("/login")
    public String getWxCode(){
        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch(Exception e) {
            e.printStackTrace();
        }
        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );
        //重定向到微信的请求地址
        return "redirect:"+url;
    }

    @GetMapping("/callback")
    public String callback(String code,String state){
        try {
            //1 获取code值，临时票据，类似于验证码
            //2 拿着code请求 微信固定的地址，得到两个值 accsess_token 和 openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数 ：id  秘钥 和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //使用httpclient去请求这个拼接好的地址,返回得到两个值 accsess_token 和 openid
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            System.out.println("accessTokenInfo: "+accessTokenInfo);
            //{"access_token":"61_e6goIcEwubEZIIxhTsYVOHlVHVea0JhCFXDSUDGjXcf_5iKOGefuGhKRY-Um7A3XbuFwWPedXjRNjRjuymFMyqPNIE13XxS9rZ11R67gAes",
            // "expires_in":7200,"refresh_token":"61_xjq_THijKVGTthabTd7RIDqr0uh-JqBiQMqmjagDaneujU7w5AysG8aa8PTroOHy8eqK1f4VIHNpVAbJyzbgvGgvivuHLWi-RwUobb8laBA",
            // "openid":"o3_SC58FCJ-YSKByYrff9l5tKPGI",
            // "scope":"snsapi_login",
            // "unionid":"oWgGz1CHVLEaWPYGneV0T1gzpw9w"}
            //把accessTokenInfo字符串装换为map集合,根据map集合中的key获取对应的值
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String accessToken = (String)mapAccessToken.get("access_token");
            String openId = (String)mapAccessToken.get("openid");

            // 3.拿着accessToken和openId再去请求地址,获取扫码人的信息
            QueryWrapper<UcenterMember> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("openid",openId);
            UcenterMember member = ucenterMemberDao.selectOne(queryWrapper);
            System.out.println(member);
            if (member == null){
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        accessToken,
                        openId
                );
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userinfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                System.out.println(userInfoMap);
                String nickname = (String)userInfoMap.get("nickname");//昵称
                String headimgurl = (String)userInfoMap.get("headimgurl");//头像
                member = new UcenterMember();
                member.setOpenid(openId);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                member.setGmtCreate(new Date());
                member.setGmtModified(new Date());
                ucenterMemberDao.insert(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.setJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
            throw new GuliException(20001,"登录失败");
        }
    }

}
